Raw onions and leeks.
Raw spring onions
Some apples, ie cox if very tart.
Red fruit and veg.
As a rule of thumb I avoid:
1. All citrus,and strongly acidic foods, such as vinegar.
2. A lot of very salty foods and those with strong flavouring also trigger a reaction in my face, that means things like salt and vinegar crisps, and a lot of low calorie snacks like the snack a jack rice crackers.
3.Yeasty products also affect me, making my face feel hot and look very flushed. It's very uncomfortable. I can't use 'nutritional yeast flakes' and some ready made soups with yeasty stocks. I use kallo products with low yeast and salt content and make my own soups.